package world
import (
"log"
"time"
"unsafe"
"edgaru089.ml/go/gl01/internal/asset"
"edgaru089.ml/go/gl01/internal/util/itype"
"github.com/go-gl/gl/all-core/gl"
)
// Vertex represents a rendering vertex in the global coordinate system.
type Vertex struct {
World itype.Vec3f // World vertex coordinate
Normal itype.Vec3f // Surface normal vector (normalized)
Texture itype.Vec2f // World Texture Atlas vertex coordinate
Light float32 // Light level of the block (0 ~ 15=blocklight, 16=sunlight)
}
func (c *Chunk) InitRender() {
gl.GenVertexArrays(1, &c.vao)
gl.BindVertexArray(c.vao)
gl.GenBuffers(1, &c.vbo)
gl.BindBuffer(gl.ARRAY_BUFFER, c.vbo)
gl.VertexAttribPointer(0, 3, gl.FLOAT, false, int32(unsafe.Sizeof(Vertex{})), gl.PtrOffset(int(unsafe.Offsetof(Vertex{}.World))))
gl.VertexAttribPointer(1, 3, gl.FLOAT, false, int32(unsafe.Sizeof(Vertex{})), gl.PtrOffset(int(unsafe.Offsetof(Vertex{}.Normal))))
gl.VertexAttribPointer(2, 2, gl.FLOAT, false, int32(unsafe.Sizeof(Vertex{})), gl.PtrOffset(int(unsafe.Offsetof(Vertex{}.Texture))))
gl.VertexAttribPointer(3, 1, gl.FLOAT, false, int32(unsafe.Sizeof(Vertex{})), gl.PtrOffset(int(unsafe.Offsetof(Vertex{}.Light))))
gl.EnableVertexAttribArray(0)
gl.EnableVertexAttribArray(1)
gl.EnableVertexAttribArray(2)
gl.EnableVertexAttribArray(3)
c.vertUpdate = make(chan []Vertex)
c.renderChanged = true
}
func (c *Chunk) FreeRender() {
gl.DeleteVertexArrays(1, &c.vao)
gl.DeleteBuffers(1, &c.vbo)
close(c.vertUpdate)
}
// Bind calls glBindVertexArray(vao) and glBindBuffer(vbo).
func (c *Chunk) Bind() {
gl.BindVertexArray(c.vao)
gl.BindBuffer(gl.ARRAY_BUFFER, c.vbo)
}
// a global vertex array for VBO updates
//var vertex []Vertex
// updateRender should be called with gl.BindBuffer(c.vbo).
func (c *Chunk) updateRender() {
if c.renderChanged {
go func() {
t := time.Now()
vert := c.AppendVertex([]Vertex{})
log.Printf("Chunk [%d,%d]: UpdateRender: vertex len of %d*%d = %d in %dms", c.X, c.Z, unsafe.Sizeof(Vertex{}), len(vert), int(unsafe.Sizeof(Vertex{}))*len(vert), time.Since(t).Milliseconds())
c.vertUpdate <- vert
}()
c.renderChanged = false
}
select {
case vert := <-c.vertUpdate:
log.Printf("Chunk [%d,%d]: received len=%d", c.X, c.Z, len(vert))
gl.BufferData(gl.ARRAY_BUFFER, int(unsafe.Sizeof(Vertex{}))*len(vert), gl.Ptr(vert), gl.DYNAMIC_DRAW)
c.vbolen = len(vert)
default: // do nothing
}
}
func (c *Chunk) Render() {
c.Bind()
c.updateRender()
gl.DrawArrays(gl.TRIANGLES, 0, int32(c.vbolen))
}
// AppendVertex appends the chunk's global vertex into the array.
func (c *Chunk) AppendVertex(arr []Vertex) []Vertex {
off := itype.Vec3i{
c.X * ChunkSizeX,
0,
c.Z * ChunkSizeZ,
}
for i := 0; i < ChunkSizeX; i++ {
for j := 0; j < ChunkSizeY; j++ {
for k := 0; k < ChunkSizeZ; k++ {
if c.Id[i][j][k] == 0 {
continue
}
app := GetBlockAppearance(off.Addv(i, j, k), int(c.Id[i][j][k]), int(c.Aux[i][j][k]), nil)
switch app.RenderType {
case OneTexture:
arr = c.appendFace(itype.XPlus, itype.Vec3i{i, j, k}, app.Name+".png", arr)
arr = c.appendFace(itype.XMinus, itype.Vec3i{i, j, k}, app.Name+".png", arr)
arr = c.appendFace(itype.YPlus, itype.Vec3i{i, j, k}, app.Name+".png", arr)
arr = c.appendFace(itype.YMinus, itype.Vec3i{i, j, k}, app.Name+".png", arr)
arr = c.appendFace(itype.ZPlus, itype.Vec3i{i, j, k}, app.Name+".png", arr)
arr = c.appendFace(itype.ZMinus, itype.Vec3i{i, j, k}, app.Name+".png", arr)
case ThreeTexture:
arr = c.appendFace(itype.XPlus, itype.Vec3i{i, j, k}, app.Name+"_side.png", arr)
arr = c.appendFace(itype.XMinus, itype.Vec3i{i, j, k}, app.Name+"_side.png", arr)
arr = c.appendFace(itype.YPlus, itype.Vec3i{i, j, k}, app.Name+"_top.png", arr)
arr = c.appendFace(itype.YMinus, itype.Vec3i{i, j, k}, app.Name+"_bot.png", arr)
arr = c.appendFace(itype.ZPlus, itype.Vec3i{i, j, k}, app.Name+"_side.png", arr)
arr = c.appendFace(itype.ZMinus, itype.Vec3i{i, j, k}, app.Name+"_side.png", arr)
case SixTexture:
arr = c.appendFace(itype.XPlus, itype.Vec3i{i, j, k}, app.Name+"_x+.png", arr)
arr = c.appendFace(itype.XMinus, itype.Vec3i{i, j, k}, app.Name+"_x-.png", arr)
arr = c.appendFace(itype.YPlus, itype.Vec3i{i, j, k}, app.Name+"_y+.png", arr)
arr = c.appendFace(itype.YMinus, itype.Vec3i{i, j, k}, app.Name+"_y-.png", arr)
arr = c.appendFace(itype.ZPlus, itype.Vec3i{i, j, k}, app.Name+"_z+.png", arr)
arr = c.appendFace(itype.ZMinus, itype.Vec3i{i, j, k}, app.Name+"_z-.png", arr)
case CustomRendering:
arr = app.CustomRenderAppend(off.Addv(i, j, k), int(c.Aux[i][j][k]), nil, arr)
}
}
}
}
return arr
}
func (c *Chunk) appendFace(face itype.Direction, pos itype.Vec3i, texname string, arr []Vertex) []Vertex {
off := pos.Addv(c.X*ChunkSizeX, 0, c.Z*ChunkSizeZ).ToFloat32()
// check if we can skip this face
next := pos.Add(itype.DirectionVeci[face])
if next[0] >= 0 && next[1] >= 0 && next[2] >= 0 && next[0] < ChunkSizeX && next[1] < ChunkSizeY && next[2] < ChunkSizeZ &&
c.Id[next[0]][next[1]][next[2]] != 0 &&
!GetBlockAppearance(
next.Addv(c.X*ChunkSizeX, 0, c.Z*ChunkSizeZ),
int(c.Id[next[0]][next[1]][next[2]]),
int(c.Aux[next[0]][next[1]][next[2]]),
nil,
).Transparent { // face next to a solid block
return arr // skip!
}
switch face {
case itype.XPlus: // X+
arr = append(arr,
// Vertex Position Normal Vector(normalized) Texture Coord Light
Vertex{off.Addv(1, 0, 0), itype.Vec3f{1, 0, 0}, itype.Vec2f{1, 1}, 16},
Vertex{off.Addv(1, 1, 0), itype.Vec3f{1, 0, 0}, itype.Vec2f{1, 0}, 16},
Vertex{off.Addv(1, 1, 1), itype.Vec3f{1, 0, 0}, itype.Vec2f{0, 0}, 16},
Vertex{off.Addv(1, 0, 0), itype.Vec3f{1, 0, 0}, itype.Vec2f{1, 1}, 16},
Vertex{off.Addv(1, 1, 1), itype.Vec3f{1, 0, 0}, itype.Vec2f{0, 0}, 16},
Vertex{off.Addv(1, 0, 1), itype.Vec3f{1, 0, 0}, itype.Vec2f{0, 1}, 16},
)
case itype.XMinus: // X-
arr = append(arr,
Vertex{off.Addv(0, 0, 0), itype.Vec3f{-1, 0, 0}, itype.Vec2f{0, 1}, 16},
Vertex{off.Addv(0, 1, 1), itype.Vec3f{-1, 0, 0}, itype.Vec2f{1, 0}, 16},
Vertex{off.Addv(0, 1, 0), itype.Vec3f{-1, 0, 0}, itype.Vec2f{0, 0}, 16},
Vertex{off.Addv(0, 0, 0), itype.Vec3f{-1, 0, 0}, itype.Vec2f{0, 1}, 16},
Vertex{off.Addv(0, 0, 1), itype.Vec3f{-1, 0, 0}, itype.Vec2f{1, 1}, 16},
Vertex{off.Addv(0, 1, 1), itype.Vec3f{-1, 0, 0}, itype.Vec2f{1, 0}, 16},
)
case itype.YPlus: // Y+
arr = append(arr,
Vertex{off.Addv(0, 1, 0), itype.Vec3f{0, 1, 0}, itype.Vec2f{0, 0}, 16},
Vertex{off.Addv(0, 1, 1), itype.Vec3f{0, 1, 0}, itype.Vec2f{0, 1}, 16},
Vertex{off.Addv(1, 1, 0), itype.Vec3f{0, 1, 0}, itype.Vec2f{1, 0}, 16},
Vertex{off.Addv(0, 1, 1), itype.Vec3f{0, 1, 0}, itype.Vec2f{0, 1}, 16},
Vertex{off.Addv(1, 1, 1), itype.Vec3f{0, 1, 0}, itype.Vec2f{1, 1}, 16},
Vertex{off.Addv(1, 1, 0), itype.Vec3f{0, 1, 0}, itype.Vec2f{1, 0}, 16},
)
case itype.YMinus: // Y-
arr = append(arr,
Vertex{off.Addv(0, 0, 0), itype.Vec3f{0, -1, 0}, itype.Vec2f{1, 0}, 16},
Vertex{off.Addv(1, 0, 0), itype.Vec3f{0, -1, 0}, itype.Vec2f{0, 0}, 16},
Vertex{off.Addv(1, 0, 1), itype.Vec3f{0, -1, 0}, itype.Vec2f{0, 1}, 16},
Vertex{off.Addv(0, 0, 0), itype.Vec3f{0, -1, 0}, itype.Vec2f{1, 0}, 16},
Vertex{off.Addv(1, 0, 1), itype.Vec3f{0, -1, 0}, itype.Vec2f{0, 1}, 16},
Vertex{off.Addv(0, 0, 1), itype.Vec3f{0, -1, 0}, itype.Vec2f{1, 1}, 16},
)
case itype.ZPlus: // Z+
arr = append(arr,
Vertex{off.Addv(0, 0, 1), itype.Vec3f{0, 0, 1}, itype.Vec2f{0, 1}, 16},
Vertex{off.Addv(1, 0, 1), itype.Vec3f{0, 0, 1}, itype.Vec2f{1, 1}, 16},
Vertex{off.Addv(0, 1, 1), itype.Vec3f{0, 0, 1}, itype.Vec2f{0, 0}, 16},
Vertex{off.Addv(1, 1, 1), itype.Vec3f{0, 0, 1}, itype.Vec2f{1, 0}, 16},
Vertex{off.Addv(0, 1, 1), itype.Vec3f{0, 0, 1}, itype.Vec2f{0, 0}, 16},
Vertex{off.Addv(1, 0, 1), itype.Vec3f{0, 0, 1}, itype.Vec2f{1, 1}, 16},
)
case itype.ZMinus: // Z-
arr = append(arr,
Vertex{off.Addv(0, 0, 0), itype.Vec3f{0, 0, -1}, itype.Vec2f{1, 1}, 16},
Vertex{off.Addv(0, 1, 0), itype.Vec3f{0, 0, -1}, itype.Vec2f{1, 0}, 16},
Vertex{off.Addv(1, 1, 0), itype.Vec3f{0, 0, -1}, itype.Vec2f{0, 0}, 16},
Vertex{off.Addv(0, 0, 0), itype.Vec3f{0, 0, -1}, itype.Vec2f{1, 1}, 16},
Vertex{off.Addv(1, 1, 0), itype.Vec3f{0, 0, -1}, itype.Vec2f{0, 0}, 16},
Vertex{off.Addv(1, 0, 0), itype.Vec3f{0, 0, -1}, itype.Vec2f{0, 1}, 16},
)
}
texrect := asset.WorldTextureAtlas.RectNormalized(texname)
for i := len(arr) - 6; i < len(arr); i++ {
arr[i].Texture[0] = texrect.Left + arr[i].Texture[0]*texrect.Width
arr[i].Texture[1] = texrect.Top + arr[i].Texture[1]*texrect.Height
}
return arr
}